Today, we will discuss three specific materials: ABS, ASA, and the ABS+ASA alloy.
What is the relationship between them? What are their key differences? And when should you choose which one?
What is the Relationship Between These Three Materials?
ABS is the "standard version"-it offers good overall performance but lacks resistance to sunlight.
ASA is the "upgraded version" of ABS-it replaces the sunlight-sensitive components found in ABS; while other performance characteristics remain largely similar, its resistance to sunlight is enhanced tenfold.
The ABS+ASA alloy is the "hybrid version"-it blends the two materials together to strike a balance: offering better sunlight resistance than pure ABS, yet remaining more affordable than pure ASA.
Simply put: ASA is the "outdoor-grade ABS," while the alloy represents the "cost-effective outdoor option."
The Core Difference: Weather Resistance (UV Resistance and Anti-Aging Properties)
This constitutes the most significant distinction among the three materials.
Why is ABS Not Resistant to Sunlight?
ABS contains a component known as "butadiene." This material features unsaturated double bonds, which are prone to degradation when exposed to ultraviolet (UV) light-much in the same way that rubber will crack after prolonged exposure to the sun.
Real-World Performance:
After just six months of outdoor exposure, the impact strength of ABS can drop by approximately 50%.
Its color will yellow and fade.
Its surface will become brittle, cracking upon even the slightest impact.
Why is ASA Resistant to Sunlight?
ASA replaces the "butadiene" found in ABS with "acrylate." The main molecular chain of acrylate possesses a saturated structure-meaning it contains no unstable double bonds-making it highly resistant to degradation by ultraviolet radiation. The Data Speaks:
ASA's weather resistance is approximately 10 times greater than that of ABS.
After 9 to 15 months of outdoor exposure, ASA exhibits virtually no decline in impact strength or elongation, and its color remains almost entirely unchanged.
Even after undergoing accelerated aging tests involving 8,000 kJ/m² of irradiation, ASA continues to maintain excellent performance.
ABS+ASA Alloy:
Weather resistance falls between that of the two constituent materials.
Performance depends on the specific blending ratio (typically ABS-dominant with ASA as the secondary component).
It offers superior UV resistance compared to pure ABS, though it does not match the performance of pure ASA.
Choose ABS: For Indoor Products
Applicable Scenarios:
Enclosures for indoor equipment (medical devices, instrumentation, control panels).
AGV/robot housings (primarily for indoor operation).
Consumer electronics enclosures.
Any components that will not be exposed to direct sunlight.
Why Choose It? It offers the best cost-performance ratio, is the easiest to mold, and provides excellent surface gloss. Since indoor environments do not require UV resistance, there is no need to incur additional costs.
Typical Applications: Medical device housings, AGV bodies, forklift interior components.
Choose ASA: For Outdoor Products
Applicable Scenarios:
Enclosures for outdoor EV charging stations.
Cabinets for outdoor energy storage systems.
Equipment subject to prolonged exposure to sunlight.
Automotive exterior components (side mirror housings, pillar trim, etc.).
Why Choose It? It can be used outdoors directly without the need for painting, offering long-term stability in both color and performance. Although the material itself is more expensive, it eliminates the costs and complexities associated with painting, potentially resulting in a lower overall project cost.
Typical Applications: Outdoor charging stations, automotive exterior parts, satellite antenna housings.
Choose ABS+ASA Alloy: For Budget-Constrained Outdoor Products
We work with all three of these materials. Send us your technical drawings, and we will provide material recommendations and a price quotation.